#start_experiment {
    position: relative;
    width: 100vw;
    min-height: calc(100vh - 60px);
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    box-sizing: border-box;
    margin-left: 250px; /* 与侧边栏宽度匹配 */
    padding: 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    grid-gap: 2rem;
    align-items: start;
    justify-items: center;
    overflow-y: auto;
}

/* 卡片基础样式 */
.experiment_card {
    width: 300px;
    position: absolute;
    transition: all 0.4s ease-in-out;
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    overflow: hidden;
    cursor: default;
    z-index: 1;
}

.experiment_card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 24px rgba(46, 90, 172, 0.15);
}

.experiment_card .card_content {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.experiment_card .card_icon {
    width: 40px;
    height: 40px;
    background: #2E5AAC;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    margin-bottom: 1rem;
}

.experiment_card .card_title {
    color: #2E5AAC;
    font-size: 1.2rem;
    margin-bottom: 0.8rem;
    font-weight: 600;
    white-space: nowrap;
}

.experiment_card .card_text {
    color: #666;
    font-size: 0.95rem;
    line-height: 1.6;
    flex: 1;
    overflow: hidden;
    display: -webkit-box;
    -webkit-box-orient: vertical;
}



/* 添加渐变分割线 */
.experiment_card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, #2E5AAC, #4A90E2);
}

/* 添加微光效果 */
.experiment_card::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    transform: rotate(25deg);
    pointer-events: none;
}

/* 四角定位 */
/* 左上角 */
#start_experiment_1 .experiment_card:nth-child(1) {
    top: 20%;
    left: 20%;
    animation: slideInFromLeft 0.5s ease forwards;
}

/* 右上角 */
#start_experiment_1 .experiment_card:nth-child(2) {
    top: 20%;
    right: 20%;
    animation: slideInFromRight 0.5s ease forwards;
}

/* 左下角 */
#start_experiment_1 .experiment_card:nth-child(3) {
    bottom: 10%;
    left: 20%;
    animation: slideInFromBottomLeft 0.5s ease forwards;
}

/* 右下角 */
#start_experiment_1 .experiment_card:nth-child(4) {
    bottom: 10%;
    right: 20%;
    animation: slideInFromBottomRight 0.5s ease forwards;
}

/* 左上角 */
#start_experiment_2 .experiment_card:nth-child(1) {
    top: 20%;
    left: 20%;
    animation: slideInFromLeft 0.5s ease forwards;
}

/* 右上角 */
#start_experiment_2 .experiment_card:nth-child(2) {
    top: 20%;
    right: 20%;
    animation: slideInFromRight 0.5s ease forwards;
}

/* 左下角 */
#start_experiment_2 .experiment_card:nth-child(3) {
    bottom: 10%;
    left: 20%;
    animation: slideInFromBottomLeft 0.5s ease forwards;
}

/* 右下角 */
#start_experiment_2 .experiment_card:nth-child(4) {
    bottom: 10%;
    right: 20%;
    animation: slideInFromBottomRight 0.5s ease forwards;
}



/* 左上角 */
#start_experiment_3 .experiment_card:nth-child(1) {
    top: 20%;
    left: 20%;
    animation: slideInFromLeft 0.5s ease forwards;
}

/* 右上角 */
#start_experiment_3 .experiment_card:nth-child(2) {
    top: 20%;
    right: 20%;
    animation: slideInFromRight 0.5s ease forwards;
}

/* 左下角 */
#start_experiment_3 .experiment_card:nth-child(3) {
    bottom: 10%;
    left: 20%;
    animation: slideInFromBottomLeft 0.5s ease forwards;
}

/* 右下角 */
#start_experiment_3 .experiment_card:nth-child(4) {
    bottom: 10%;
    right: 20%;
    animation: slideInFromBottomRight 0.5s ease forwards;
}


/* 左上角 */
#start_experiment_4 .experiment_card:nth-child(1) {
    top: 20%;
    left: 20%;
    animation: slideInFromLeft 0.5s ease forwards;
}

/* 右上角 */
#start_experiment_4 .experiment_card:nth-child(2) {
    top: 20%;
    right: 20%;
    animation: slideInFromRight 0.5s ease forwards;
}

/* 左下角 */
#start_experiment_4 .experiment_card:nth-child(3) {
    bottom: 10%;
    left: 20%;
    animation: slideInFromBottomLeft 0.5s ease forwards;
}

/* 右下角 */
#start_experiment_4 .experiment_card:nth-child(4) {
    bottom: 10%;
    right: 20%;
    animation: slideInFromBottomRight 0.5s ease forwards;
}

/* 左上角 */
#start_experiment_5 .experiment_card:nth-child(1) {
    top: 20%;
    left: 20%;
    animation: slideInFromLeft 0.5s ease forwards;
}

/* 右上角 */
#start_experiment_5 .experiment_card:nth-child(2) {
    top: 20%;
    right: 20%;
    animation: slideInFromRight 0.5s ease forwards;
}

/* 左下角 */
#start_experiment_5 .experiment_card:nth-child(3) {
    bottom: 10%;
    left: 20%;
    animation: slideInFromBottomLeft 0.5s ease forwards;
}

/* 右下角 */
#start_experiment_5 .experiment_card:nth-child(4) {
    bottom: 10%;
    right: 20%;
    animation: slideInFromBottomRight 0.5s ease forwards;
}


/* 左上角 */
#start_experiment_6 .experiment_card:nth-child(1) {
    top: 20%;
    left: 20%;
    animation: slideInFromLeft 0.5s ease forwards;
}

/* 右上角 */
#start_experiment_6 .experiment_card:nth-child(2) {
    top: 20%;
    right: 20%;
    animation: slideInFromRight 0.5s ease forwards;
}

/* 左下角 */
#start_experiment_6 .experiment_card:nth-child(3) {
    bottom: 10%;
    left: 20%;
    animation: slideInFromBottomLeft 0.5s ease forwards;
}

/* 右下角 */
#start_experiment_6 .experiment_card:nth-child(4) {
    bottom: 10%;
    right: 20%;
    animation: slideInFromBottomRight 0.5s ease forwards;
}